Question

(viii) Which has highest b.pt. ?
(a) NH
(b) PH
(d) SbH
(c) AsH₃​

Answer 1

Explanation:

NH

3

has higher boiling point than AsH

3

and PH

3

on account of H-bonding. SbH

3

has highest boiling point on account of highest molecular weight.

(2) As the size of element increases, the strength of M-H bond decreases and thus stability decreases.

(3) Basicity decreases down the group. (Drago rule).

(4) HEH angle ('): NH

3

=107.8;PH

3

=93.6;AsH

3

=91.6;SbH

3

=91.3.

Answer 2

Answer:

C is the correct answer SbH